And that already made them more useful than the 'just glamour' Zodiac and Anima weapons. There was hardly any story in the Zodiac/Anima questlines either. Gerolt bickering with Rowena and a random assortment of experts while the weapon glows in the background don't make for an engaging story.
The relics are superfluous in the sense that their purpose were slowly being replaced by other features of the game. The incentive aspect to do old content was largely taken over by Wondrous Tails/Moogle event/BLU. If they need people to do FATEs, add more bi-color gemstones rewards. You get the idea. The tome weapons were already a viable alternative to the relics and much less grindy. Especially to people who don't much care for Savage/Ultimate content where BiS matters the most.
